How to remove certain part of the object name for hundreds of objects?
For selected objects:

import bpy 

for o in bpy.context.selected_objects:
    o.name = o.name.replace("marketing_", "")


Or for all objects in the scene:

for o in bpy.context.scene.objects:
    o.name = o.name.replace("marketing_", "")


Or for all objects in the file:

for o in bpy.data.objects:
    ...